C#基于HttpWebRequest实现发送HTTP请求的方法分析

using HttpWebRequestusing System.IO

/// <summary>/// 发送GET请求/// </summary>/// <param name="url">请求URL，如果需要传参，在URL末尾加上“？+参数名=参数值”即可</param>/// <returns></returns>static string HttpGet(string url){  //创建  HttpWebRequest httpWebRequest = (HttpWebRequest)HttpWebRequest.Create(url);  //设置请求方法  httpWebRequest.Method = "GET";  //请求超时时间  httpWebRequest.Timeout = 20000;  //发送请求  HttpWebResponse httpWebResponse = (HttpWebResponse)httpWebRequest.GetResponse();  //利用Stream流读取返回数据  StreamReader streamReader = new StreamReader(httpWebResponse.GetResponseStream(), Encoding.UTF8);  //获得最终数据，一般是json  string responseContent = streamReader.ReadToEnd();  streamReader.Close();  httpWebResponse.Close();  return responseContent;}

/// <summary>/// 发送POST请求/// </summary>/// <param name="url">请求URL</param>/// <param name="data">请求参数</param>/// <returns></returns>static string HttpPost(string url, string data){  HttpWebRequest httpWebRequest = (HttpWebRequest)HttpWebRequest.Create(url);  //字符串转换为字节码  byte[] bs = Encoding.UTF8.GetBytes(data);  //参数类型，这里是json类型  //还有别的类型如"application/x-www-form-urlencoded"，不过我没用过(逃  httpWebRequest.ContentType = "application/json";  //参数数据长度  httpWebRequest.ContentLength = bs.Length;  //设置请求类型  httpWebRequest.Method = "POST";  //设置超时时间  httpWebRequest.Timeout = 20000;  //将参数写入请求地址中  httpWebRequest.GetRequestStream().Write(bs, 0, bs.Length);  //发送请求  HttpWebResponse httpWebResponse = (HttpWebResponse)httpWebRequest.GetResponse();  //读取返回数据  StreamReader streamReader = new StreamReader(httpWebResponse.GetResponseStream(), Encoding.UTF8);  string responseContent = streamReader.ReadToEnd();  streamReader.Close();  httpWebResponse.Close();  httpWebRequest.Abort();  return responseContent;}

httpWebRequest.GetRequestStream().Write(bs, 0, bs.Length);